Murr D P
Experientia. 1977 Dec 15;33(12):1559-61. doi: 10.1007/BF01933995.
A metabolic intermediate isolated from apple tissue fed either methionine or 5'-methylthioadenosine has been tentatively identified as a methionine-pyridoxal Schiff base. The formation of this compound is discussed in relation to ethylene biosynthesis.